The "real" threat in climate change, to me, is if the models are off the wrong way and/or we get into a spiraling situation. Folks claim this isn't very likely, but folks can be wrong. The permafrost significantly melts and releases a lot of methane, the major ice shelves in Antarctica give way, large glaciers are released into the ocean, Greenland melts, CO2 levels continue to rise, but they end up being relatively "minor" contributors to the overall mess, and maybe the Sun goes wonky the bad way too.
I THINK most of humanity can manage with the projected T increases with some obvious exceptions.
